Lock



G. LALlTY ET AL Oct. 27, 1931.

LOCK

Filed Feb. 6. 1929 Patented Oct. 27, 1931 PATENT OFFICE GEORG LALITY AND NANDOR KARPATI, F BUDAPEST, HUNGARY LOCK Application filed February 6, 1929, Serial No. 337,987, and in Hungary February 9, 1928.

This invention relates to an improved lock which is distinguished from locks hitherto known by its simple design and efliciency.

In the accompanying drawings an embodi- 1 ment of the invention is shown by Way of example, in which:

Figure 1 is an elevation illustrating the interior of the lock casing with the lock in the open position.

Figure 2 is a section on the line AB of Figure 1.

Figure 8 is an elevation of the interior of the lock with the look in the closed or shot position.

Figure 4 illustrates a plate for actuating the lock-bolt in side and front elevation and Figure 5 shows a tumbler in side and front elevation.

Referring to the drawings a is the lock casing in which is mounted a lock-bolt Z) provided with a horizontal guide slot 0 with which a guide pin cl projecting inwardly from thewall of the casing engages.

In the plane of the lock-bolt there is arranged a latch plate 7' rotatable on a pivot g. This latch plate is provided with a nose It adapted to engage a groove-shaped notch 2' on the inside edge of the lock-bolt.

Adjacent the notch z the lock-bolt is chamfered, which renders it possible for the nose 7 to leave the groove 2' in a certain position of the lock-bolt.

In the centre of the plate f an aperture y' is provided which is so dimensioned as to provide sufficient space for the turning of the web of the key. The side of this aperture facing the lock-bolt is limited by an arcuate wall is along which the web of the key grazes. In front of the nose a groove-shaped notch m is formed in which the key web engages during turning and by means of which the key turns the plate f.

The tumblers n are not spring operated as in prior arrangements but are provided with Vertical slots 0 in which engage guide pins p projecting from the lock casing. The slots and pins only permit of a vertical positive movement of the tumblers. In addition, horizontal notches p and vertical slots 7' are provided on the tumblers which serve to permit the passage of the locking pin 8 projecting from the lock-bolt. Finally on each of the individual tumblers an aperture 6 is provided for the passage of the key. These apertures are at such a height in the tumblers and are so formed that they enable the key web, in both extreme positions, i. e. in the open and closed or shot state of the lock-bolt, to penetrate into the interior of the lock case, but as soon as the lock-bolt leaves either extreme position, only the part of the openings under the key-hole of the lock case remains which permits the passage of the key-shank.

To operate the look a key is used, on the shank of which and on the side opposite the key-web c1 channels are cut for taking up the edges of the tumblers.

The lock operates in the following manner The key Web 1) is introduced into the open lock in the position shown in Figure 1 and to operate the bolt, the web is turned in the direction of the arrow Fig. 1. During this turning movement the key web lifts the tumblers n into a position in which the locking 5 pin 8 of the lockbolt comes in front of the notch p of the tumblers. During this upward vertical displacement the tumblers are guided by the pins'p and by the slots -0. The tumblers, during their upward movement, '6 completely cover the key-hole of the lockcase, so that no foreign body, for example wire or the like can be inserted into the lock, for the purpose of opening the lock. During the movement of the tumblers by the key into 5 a position in which the pin 8 is in front of the notch p the key-web passes along the arcuate edges 7; of the aperture j of the plate f until it reaches a position in front of the notch m. The key-web then engages in the go notch m and on further movement carries the plate 7 with it, whereby the nose h of the latter, engaging in the groove 2' of the lockbolt, displaces the latter out of the lock casing in a horizontal direction. After the lock bolt Z2 is'closed, the web springs out of the recess m, turns underneath the left-hand arcuate segment is, until engagement, striking against which it turns the plate f to the left so that the tooth projection h is pressed ion i more perfect-than the locks hitherto known I With tumblers turning by their own Weight v movement of the lock-bolt the tumble s cover h the key-holefand also in" the fact thatthe p p latch plate" '7 owing to its peculiar form tightly against the left-hand slope of the v Y. headset lock-bolt adjacent the groove '5 thereby preventingforcible pressing back of the lockbolt from the outside. On opening the operation is reversed.

During the outward movement of the lock-- 7 a bolt the pin passes along the notch]; of the tumblers and then passes out of same and reaches a p'ositionin front of the tumblers; 1 in which position the Withdrawal of the lock- N bolt is prevented (Fig.f-3)';"

To release the locking actlon, the key first 1 moves the tumblers in vertical direction into the positionin' hich'thepin 8 comes in front fact that no springs are employed so that its design and action is more secure than that of'thehithertoknovvn lock-s. .The tumblers move positively in a vertical direction,

actuated bythe key-Web. This lock is much around a pivot, as the latter,oWing tofriction, pressing or catching on each other ire:

'quentlyjam and cann'ot move, Whereas in the lock'acco'rding' to the present invention,

each individual tumbler is moved positively blers engage- If an attempt is made to raise ,by the keyeb This is also achieved by the fact that the key-shaft opposite the Web, is provided with notches in which the tumthe tumblers With the aid of a strangekey, they imn'iediately cover the keyhole, rendering' forcible opening impossible. A further advantage resides inthe fact that during the guides the key-Web; in its movement until engaged in the-notch r i lVhat'vveclaimisz v A springlesssafety lock comprising a easing having a keyhole therein, a lock-boltin,

said casing, tumblers in said casingcapable arranged so that wli'enithe t mblers are in raise d positiononly sufiicient opening is p left in the said apertures for, the passage of the key-shank whereby forced opening of s I the lock is prevented. l 7

Intestimony whereof We havesignedou'r 5 nam s to this specifi t GEORG L IT'Y. 1

of being raised and lowered vertically by a W I v key-Web, and apertures in each of said tum? j bler's" forthe passage of the key-Web, the apertures in the tumblers-being'formed' 

